Question about 1986 Yamaha RD 350
You need to check clearance betwween piston and bore.It should be 1 1/2 thou clearance at the base(widest part)of piston.If it is less than this or more than 2 thou (0.002")then you will get problems.
Make sure it has been bored properly and that bore diameter is the same throughout the length.
Ring gaps should be about 7 thou,and no less or you will get seizing.
If you have a powervavle it should be set correctly too.I raced RD 350s for nearly 10 years and there is so much you can do but it can take time, but I will help you if you are interested.I could give you starting points for tuning if you can tell me carb size,whether you have expansion pipes,airfilter type etc ,etc.Oh dond forget not to fit plugs that are too hot like a bp6hs etc. as you can hole your piston too.
In the mean time check the piston,bore and rings and get back to me if you need more help.
Posted on Sep 11, 2009
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Posted on Jan 02, 2017
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